滚雪球公式的原理简介：At this time, the place where they were standing was the most crowded place at the innermost part of the Sun Observation Deck, and there was a long queue. There was a cable car going down here, so it was very crowded.
At this time, the place where they were standing was the most crowded place at the innermost part of the Sun Observation Deck, and there was a long queue. There was a cable car going down here, so it was very crowded.
